W209A + Smartphone Battery Fast charger and 2 in 1 Tool activated for iPhone X & 8 Plus and 8 and 7 Plus and 6s Plus and 6s and 6 Plus and 6 & 5C & 5SE & 5S & 5 & 4S & 4, all samsung & OPPO & Huawei & vivo & Xiaomi Etc 1. Automatic recognition of the possive and negative battery. 2. fast charge function. 3. Current overload protection and automatic power off after full charge. 4. A key to activate the battery. 5. Battery voltage detection. 6. Dual voltage and current display. 7. Charge status notice.